Elame arc lamp with inclosed arc



1,629,254 T. CARBONE FLAME ARC LAMP WITH mowssn Anc Filed Nov. 25 1922 Inventor 7. g 4w: y

Jttornsyill result of changes of temperature.

Patented May 17, 1927v curren s'raras "The LiVIO cannons, nncnnsnn, erner BERLIN, GERMANY; BY ERNST MOMMSIEN,

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FLAME AnoLAMr WITH iivcnosnnAno.

Application filed November 25, 1922, Serial No. 603,358, and in Germany April 24, 1922-.

in flame arc lamps with inclosed arcs it has already been proposed to surround the zone of the lamp globe which must; as far as possible. be kept from becoming dinnned, with a second external globe so as to prevent excessive cooling. This external globe was attached like the globe proper to the metal shade or plate of the lamp and consequently was subjected to irregular expansion as the W It will be readily understood that as a consequence the close fit of the contacting surfaces became imperfect and rendered it impossible to keep the zone of the globe free from deposits. All the proposals which have been made hitherto on these lines have consequently not attained the desired object, but must be considered on the. contrary to have failed. Furthermore if it be taken into consideration that flame are lamps of recent construction will burn for from 200 to 250 hours and. more, it will be seen that it is no longer possible to keep the zone of the lamp globe from becoming dimmed for any length of time by means of the devices hitherto known. Now, as exhaustive experiments have shown, that part of the lamp globe through which the light is to be emitted can be kept perfectly clear and for'any period of burning if the following details be taken into consideration. The lamp globe and the condensing chamber for the deposits, which chamber is arranged above the arc, must be made in one piece of glass or equivalent material and have very few, if possible only one position, where a tight joint is made with the lamp proper. This position must also be kept as remote as possible from the heat radiated from the arc. The zone of the lamp globe, which must al.- ways remain clear, must be protected against being cooled from outside, and such protection may be afforded by a separate outer globe, no gases from the lamp being allowed to pass into the intermediate space between the lamp globe proper and the outer globe inclosing it. The expansion and contraction which take place owing to changes of temperature must in no circumstances produce any imperfect joints;

The disadvantages before referred to are avoided and the necessary conditions attained according to the present invention by providing the lamp globe, which is made in one piece with the condensing chamber for the deposits, with a glass jacket around the part whiclris required. to be free from deposit, this jacket being applied in such a way that its upper edge bears against the lower glass wall of the condensing chamber and its lower and slightly constricted edge is retained by a packing and fitting ring situated on the lower part of the globe. In this case, the lamp globe is fitted with an airtight joint to thecover of the lamp above the condensingchamber and, therefore, at a p: 'iion which is removed from the beat raciated from the arc. The outer globe is not in communication in any way with the interior of the lamp globeand no imperfect joints can be formed by changes of tempera ture as the packing and fitting ring for the outer globe is placed at a position on the lamp globe proper which is not heated cxcessivcly by the heat from the arc, but on the contrary remains comparatively cool.

An example of construction according to the invention is shown in the accompanying drawing in longitudinal section.

The are lamp glolie (i consists, together with the deposit condensing chamber 7) arranged above the arc, of one single piece of glas. The globe is fitted with an airtight joint to the cover or plate 0 of the lamp in the known manner. This joint (Z is removed as much as possible from the action of the heat of the are by the shield (not shown) arranged above the arc, so that unequal expansion of the glass globe and the metal lamp cover or plate does not occur. The zone of the lamp globe a which is to remain permanently free from deposit is surrounded with a jacket 6 of glass or similar material, which protects the said zone from being cooled and by reason of its high temperature prevents the settling of any deposits. The outer globe c bears with its upper edge f against the lower glass wall of the deposit condensing chamber 7). in consequence, therefore, of the material of the lamp globe being similar to that of the deposit con-- and is mounted ata position which is not exposed to the heat rays of the arc and therefore remains comparatively cool.

I claim as the invention of Trro LIVIO CARBONEZ v 1. A globe for arc-lamps of the inclosed arc type comprising in combination a substantially tubular part of glass, the upper part of which incloses the arcfa depositcondensing chamber located at the upper end of the said tubular part anal formed in the saline piece with and as an integral enlarge ment of the said tubular part the said chamber having an annular bottom, and a jacket surrounding the arc-inclosing portion of the said tubular part, the said jacket contacting at its upper edge with the annular bottom of the said'cl'iamber and at its lower edge fitting closely around the said tubular part, substantially as described.

A globe for arc-lamps of the inclosed are type comprising in combination a substantially tubular part of? glass, the upper part of which, incloses the are, a, depositcondensing chamber located at the upper end of the said tubular part and formed in the same piece with and as an integral enlargement of the said tubular part, the said chan iber having an annular bottom, a jacket surrounding the are-inclosing portion oi the said tubular part, the said jacket contacting at its upper edge With the annular bottom of the said chamber and at its lower edge encircling the said tubular part, and a packing ring interposed between the lower edge of the said jacket and the lower end of the said tubular-part at a position not exposed to' the heat of the are, substantially as described.

DR. ERNSTMOMMSEN, Executor of the last will and testament of Tito Lz'm'o' Carbone, deceased. 

